def forward_1():
  SipPhone2.SetForwarding(1, DN3)
  SipPhone1.MakeCall(DN2)
  SipPhone3.AnswerCall()
  SipPhone1.ReleaseCall()
  SipPhone2.SetForwarding(0) 

def forward_mon_1():
  DN2.CallSetForward( DN3)
  DN1.MakeCall(DN2)
  DN3.AnswerCall()
  DN1.ReleaseCall()
  DN2.CallCancelForward() 

def forward_2():
  SipPhone2.SetForwarding(1, DN3)
  SipPhone2.GetForwarding()
  SipPhone2.SetForwarding(0) 
  SipPhone2.GetForwarding()

def forward_mon_2():
  SipPhone2.SetForwarding(1,  DN3)
  SipPhone2.GetForwarding()
  SipPhone2.SetForwarding(0) 
  SipPhone2.GetForwarding()